body{
    margin: 0;
    background-color: aliceblue;
}
#all{
    margin: 0 auto;
    width: 1100px;
    height: 800px;
}
#all .top{
    margin: 0;
    float: left;
    width: 1100px;
    height: 100px;
    background-image: url("../img/index_top.jpg");
    font-size: 20px;
}
#all .top .left{
    float: left;
    margin: 10px 0 0 100px;
    width: 600px;
    height: 100px;
}

#all .top .right{
    float: left;
    margin: 10px 0 0 50px;
    width: 350px;
    height: 100px;
}
#all .top .right a{
    text-decoration: none;
    color: black;
}
#all .center {
    margin: 0;
    float: left;
    width: 1100px;
    height: 800px;
    background-color: beige;
}
#all .center .middle{
    margin: 0 0 0 80px;
    float: left;
    width: 930px;
    height: 772px;
    background-image: url("../img/update.jpg");
}
#all .center .middle .ball{
    margin: 200px 0 0 250px;
    float: left;
    width: 600px;
    height: 350px;
}
#all .center .middle .ball .tip{
    float: left;
    margin:0;
    width: 600px;
    height: 50px;
}
#all .center .middle .ball .tip .left2{
    margin: 0;
    float: left;
    width: 320px;
    height: 50px;
}
#all .center .middle .ball .tip .left2 .left3{
    margin: 0;
    float: left;
    width: 100px;
    height: 50px;
}
#all .center .middle .ball .tip .left2 .right3{
    margin: 0;
    float: right;
    width: 220px;
    height: 50px;
}

#all .center .middle .ball .tip .right2{
    margin: 0;
    float: left;
    width: 280px;
    height: 50px;
}
